Chemical thermodynamics is a branch of physical chemistry that deals with the study of energy changes, particularly heat and work, and how these changes relate to chemical reactions and processes. It provides the framework for understanding how and why chemical reactions occur, the direction and extent of reactions, and the energy transformations involved. Key concepts in chemical thermodynamics include: 1. **First Law of Thermodynamics**: This law states that energy cannot be created or destroyed, only converted from one form to another.
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Chemical thermodynamics studies energy, entropy, and equilibrium in chemical systems. At fixed temperature and pressure, the direction of spontaneous change is constrained by Gibbs free energy, and equilibrium corresponds to an appropriate minimum subject to the system's conserved quantities.
For a reaction, , where is the reaction quotient. Setting gives for the dimensionless equilibrium constant. This connects measurable composition with free energy. It does not determine the reaction rate, which also depends on the accessible pathway and its activation barriers.